Make the current position in the audio sample a fix point

agb/src/sound/mixer/mixer.rs

@@ -36,9 +36,9 @@ impl Mixer {
                 self.buffer_r.write_channel(some_channel);
                 some_channel.pos += SOUND_BUFFER_SIZE;
 
-                if some_channel.pos >= some_channel.data.len() {
+                if some_channel.pos.floor() >= some_channel.data.len() {
                     if some_channel.should_loop {
-                        some_channel.pos = 0;
+                        some_channel.pos = 0.into();
                     } else {
                         has_finished = true;
                     }
@@ -105,7 +105,7 @@ impl MixerBuffer {
     }
 
     fn write_channel(&mut self, channel: &SoundChannel) {
-        let data_to_copy = &channel.data[channel.pos..];
+        let data_to_copy = &channel.data[channel.pos.floor()..];
         let place_to_write_to = self.get_write_buffer();
 
         for (i, v) in data_to_copy.iter().take(SOUND_BUFFER_SIZE).enumerate() {

agb/src/sound/mixer/mod.rs

@@ -3,6 +3,8 @@ mod mixer;
 
 pub use mixer::Mixer;
 
+use crate::number::Num;
+
 #[non_exhaustive]
 pub struct MixerController {}
 
@@ -18,7 +20,7 @@ impl MixerController {
 
 pub struct SoundChannel {
     data: &'static [u8],
-    pos: usize,
+    pos: Num<usize, 8>,
     should_loop: bool,
 }
 
@@ -26,7 +28,7 @@ impl SoundChannel {
     pub fn new(data: &'static [u8]) -> Self {
         SoundChannel {
             data,
-            pos: 0,
+            pos: 0.into(),
             should_loop: false,
         }
     }